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Abstract

The overall performance of modern computing systems is increasingly determined by
the characteristics of the interconnection network used to provide communication
links between on-chip cores and off-chip memory. Photonic technology has been
proposed as an alternative to traditional electronic interconnects because of
its advantages in bandwidth density, latency, and power efficiency.
Circuit-switched photonic interconnect topologies take advantage of the optical
spectrum to create high-bandwidth transmission links through the transmission of
data channels on multiple parallel wavelengths; however, this technique suffers
from low path diversity and high setup time overhead, which induces high network
resource contention, unfairness, and long latencies. This work improves upon the
circuit-switching paradigm by introducing the use of on-chip
wavelength-selective spatial routing to produce multiple logical communication
layers on a single physical plane. This technique yields higher path diversity
in photonic interconnection networks, demonstrating as much as 764%
saturation bandwidth improvement with synthetic traffic and as much as
89% improvement in execution time and energy dissipation for traffic from
scientific application traces.

References

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